Answer:
For 135 students , the number of teacher requires is 9
Step-by-step explanation:
Given as :
The number of teacher = 6
The number of student = 90
∵ For 90 students , the number of teacher requires = 6
So , For 1 student , the number of teacher requires = 
= 
∴ For 135 student , the number of teacher requires =
×135
Or, For 135 student , the number of teacher requires = 
So, For 135 student , the number of teacher requires = 9
Hence For 135 students , the number of teacher requires is 9 Answer